4 letters
- scup11
- snap8
- snip8
- span8
- spay9
- spic10
- spin8
- spun9
- sync10
- tain5
- tiny7
- tuna6
- tyin7
- ulan7
- ulna7
- unai6
- unau7
- unci9
- unco9
- undy9
- unit6
- upas8
- upby13
- upon9
- uric8
- vain9
- vina9
- viny11
- wain8
- wany10
- winy10
- yack13
- yagi8
- yang9
- yank11
- yaps9
- yarn7
- yaud8
- yaup10
- yawn10
- yawp12
- yean7
- yins7
- yipe9
- yips9
- yoni7
- yuan8
- yuca10
- yuch12
- yuck14
- yuga9
- yups10
- zany16
- zinc17